Dustballs in Skyward Sword

If you had difficulty finding the dust-balls necessary for the upgrades then you might be interested in knowing where you can farm them. If you go to Lanayru Desert and you drop into the area with the elemental maze, if you stand at the top of the multilevel pyramid and face towards the elemental gate you’ll see a cave set in the wall opposite the temple. If you head to the cave and then hang around outside it every 20-30 seconds a dust-ball will drift by. I was able to farm 5 of them in 10 mins like this.